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大气视宁度严重影响了地面望远镜观测的成像分辨率。对于直径rL的单孔镜,Fried给出恒星光波波前到达角的均方差为<α2>=0.358(λrL)1/3(λr0)5/3这一公式被很多文献所采用,并推广应用于双瞳视宁度仪测量,等等。事实上,Yura和Tavis(1985)指出,恒星光波波前的瞬间倾角与星像重心在焦平面的角位置并不完全相关,波前倾角的方差与焦平面重心的方差也是不一致的。实际测量中,我们常使用的是焦平面像重心的测量。因此,使用的公式应当有所修正。本文从Tatarski的理论公式出发,更简捷地得到了同样的结果。即,所使用的公式应修改为<α2>=0.339(λrL)1/3(λr0)5/3与此有关的视宁度测量公式中的其他常数也需修改 相似文献
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大气视宁严谨严重影响了地面望远镜观测的成像分辩率。对于直径rL的单孔镜,Fried给出恒星光波波前到达角的均方差为〈a^2〉=0.358(λ/rL)^1/3(λ/r0)^5/3这一公式被很多文献所采用,并推广应用于双瞳视宁度仪测量,等等。事实上,Yura和Tavis(1985)指出,恒星光波波前的瞬间倾角一像重心在焦平面的角位置并不完全相关,波前倾角的方差与焦平面重心的方差也不是一致的。实际测量中 相似文献
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Pei Chong Yuan Xiang-Yan Chen Hua-Lin Zhao Jian-Lin WEN Hai-Kun Li Zheng-Yang 《Chinese Astronomy and Astrophysics》2012
The Antarctic site-testing campaigns have shown that Dome C is an excellent astronomical site on the earth, it is better than any of existing mid-latitude astronomical sites in the world, because of its cold and dry weather, low infrared background radiation, continuously observable time as long as 3–4 months, clear and highly transparent atmosphere, low wind speed, and the absence of dust and light pollution. And in the international astronomical community it is generally believed that Dome A with a higher altitude may be better than Dome C as a potential excellent astronomical site. In the past 3 years, although held by the Center for Antarctic Astronomy of Chinese Academy of Sciences, the site testing at Dome A has preliminarily con?rmed the many advantages of Dome A as an excellent astronomical site, but the data about the atmospheric seeing, which is an important parameter for assessing the site quality for optical observations, have not been obtained until now. Hence, on the basis of a commercial telescope with the diameter of 35 cm, we have made the hardware reformation and software development to have it operate as a DIMM (Differential Image Motion Monitor), which can simultaneously monitor both the seeing and isoplanatic angle at Dome A automatically. At present this instrument has been shipped to Antarctica by the “Xuelong” exploration ship, and will be installed at Dome A, and begin to work in early 2011. Before the shipment, by through the comparative measurements together with an existing seeing monitor at the Xinglong astronomical station, the software, hardware, as well as the installation and adjustment of the instrument, are further veri?ed by testing. 相似文献
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S. Hagelin E. Masciadri F. Lascaux J. Stoesz 《Monthly notices of the Royal Astronomical Society》2008,387(4):1499-1510
The atmospheric properties above three sites (Dome C, Dome A and the South Pole) on the Internal Antarctic Plateau are investigated for astronomical applications using the monthly median of the analyses from ECMWF (the European Centre for Medium-Range Weather Forecasts). Radiosoundings extended on a yearly time-scale at the South Pole and Dome C are used to quantify the reliability of the ECMWF analyses in the free atmosphere as well as in the boundary and surface layers, and to characterize the median wind speed in the first 100 m above the two sites. Thermodynamic instability properties in the free atmosphere above the three sites are quantified with monthly median values of the Richardson number. We find that the probability to trigger thermodynamic instabilities above 100 m is smaller on the Internal Antarctic Plateau than on mid-latitude sites. In spite of the generally more stable atmospheric conditions of the Antarctic sites compared to mid-latitude sites, Dome C shows worse thermodynamic instability conditions than those predicted above the South Pole and Dome A above 100 m. A rank of the Antarctic sites done with respect to the strength of the wind speed in the free atmosphere (ECMWF analyses) as well as the wind shear in the surface layer (radiosoundings) is presented. 相似文献
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K. G. Strassmeier K. Agabi L. Agnoletto A. Allan M. I. Andersen W. Ansorge F. Bortoletto R. Briguglio J.‐T. Buey S. Castellini V. Coud du Foresto L. Dam H. J. Deeg C. Eiroa G. Durand D. Fappani M. Frezzotti T. Granzer A. Grschke H. J. Krcher R. Lenzen A. Mancini C. Montanari A. Mora A. Pierre O. Pirnay F. Roncella F.‐X. Schmider I. Steele J. W. V. Storey N. F. H. Tothill T. Travouillon L. Vittuari M. Weber 《Astronomische Nachrichten》2007,328(6):451-474
This article reviews the situation for robotization of telescopes and instruments at the Antarctic station Concordia on Dome C. A brain‐storming meeting was held in Tenerife in March 2007 from which this review emerged.We describe and summarize the challenges for night‐time operations of various astronomical experiments at conditions “between Earth and Space” and conclude that robotization is likely a prerequisite for continuous astronomical data taking during the 2000‐hour night at Dome C. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Xu Zhou Zhen-Yu Wu Zhao-Ji Jiang Xiang-Qun Cui Long-Long Feng Xue-Fei Gong Jing-Yao Hu Qi-Sheng Li Gen-Rong Liu Jun Ma Jia-Li Wang Li-Fan Wang Jiang-Hua Wu Li-Rong Xia Jun Yan Xiang-Yan Yuan Feng-Xiang Zhai Ru Zhang Zhen-Xi Zhu National Astronomical Observatories Chinese Academy of Sciences Beijing China Nanjing Institute of Astronomical Optics & Technology National Astronomical Observatories Nanjing China Purple Mo... 《中国天文和天体物理学报》2010,10(3)
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射电望远镜天线结构设计和观测任务的正常进行都需要台址风场信息.随着望远镜性能要求的提高,天线结构设计越来越复杂,风载荷对天线观测时造成的指向影响也越发明显,如何在设计时保证结构刚度和强度,在观测时提高有效观测时间,都需要准确的风场数据.由于传统台址测风塔布置方法无法对测风塔拟设点的可靠性做出定量化评估,因此提出一种基于数值模拟优化测风塔位置的方法.数值模拟基于规范参数设置边界条件,与实测数据比较,整体趋势吻合,满足精度需求.对试验台址设置了4个测风塔位置,经分析P2点与天线位置的风速均方根误差值(root-mean-square error, RMSE)最小,测得的数据更能表征天线区域的风场特性. 相似文献
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R. W. Wilson N. O'Mahony C. Packham M. Azzaro 《Monthly notices of the Royal Astronomical Society》1999,309(2):379-387
We present results from a study of the seeing quality at the 4.2-m William Herschel telescope at La Palma. The median intrinsic seeing at the site is found to be excellent, and is comparable to that at the Paranal and Mauna Kea observatories. Contributions to the seeing from turbulence within the telescope dome are insignificant. Furthermore, the optical quality and tracking stability of the telescope are good, so that long-exposure image widths close to the limit imposed by the site seeing can be expected. 相似文献